Electric switch with manometric control



y 0, 1938. c. H. H. RODANET 2,117,213

ELECTRIC SWITCH WITH MANOMETRIC CONTROL Filed July 30, 1956 2Sheets-Sheet l 8 .FIQQ. a 1 14 22 Feb. 22 25 INVENTOR CHARLES H ILAIREHENRI RODANET Mf AT TOR N 5Y5 0. H. H. RODANET ELECTRIC SWITCH WITHMANOMETRIC CONTROL May 10, 1938.

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1 j'lllilllllfllr Patented May l0, 1938 UNITED STATES ELECTRIC swrrcnwrrn momcrarc CONTRD Charles Hilaire Henri ltodanet, Nenllly-sur-Seine,

France, aasignor to Socit Anonyme: Etablissements Ed. Jaeger,Lavallois-Perret, France Application July 30, 1936, Serial No. 93,423

In France June 18, 1936 2 Claims.

'Ihis invention relates to an electric switch with manometric control,and is particularly characterized by the fact that the fluid, which bypressure controls the operation of the switch, acts on a flexiblediaphragm capable, upon being distorted, of acting on the movablecontact of the electric switch.

The main object of the present invention is to have a switch controlprovided with a flexible l0 diaphragm mounted in a fluid-tight mannerwithin a casing in which are also arranged the contacts of the switch,and which may also be secured, at its periphery, on a rigid d sc ofsubstantially conical shape and on the periphery of which bearsthebentdown edge or flange of another disc on which are mounted thefixed and movable contacts of the switch.

It is also an object to have the flexible diaphragm and the twomentioned discs welded 9 within the casing so as to constitute, oppositesaid diaphragm, a fluid-tight space connected, by a conduit or the like,to the source of fluid under pressure.

A further object is to have a movable contact of the switchconstituted'by a flexible blade secured, at one of its ends, to the dischaving the bent down edge or flange, and provided, at its other end,with a contact piece, a flnger, mounted on this blade, passing throughboth rigid discs, preferably at their center, so as to be capable ofcoming directly or indirectly in contact with the flexible diaphragmwhen the latter becomes distorted under the influence of the pressure ofthe fluid, and the mentioned finger may be adjustably mounted on saidflexible blade carrying the movable contact of the switch.

It is also an object to have the flxed contact piece mounted on the dischaving a bent down edge and suitably electrically insulated therefrom,while the flexible. blade may be mounted on the disc having a bent downedge. but electrically insulated therefrom, and to have the rear portionof the casing closed bya small plate of insulating material throughwhich the connecting tongue or tongues pass which are respectivelyconnected to the fixed contact piece and eventually to the flexibleblade carrying the movable contact piece.

w The present invention further relates to a number of particularfeatures which will appear from the following description with referenceto the accompanying drawings, given by way of example only, in which:

Fig. 1 is a side view of a. form of construction of an improvedapparatus according to the invention.

Fig. -2 is a diametral section made according to line 11-11 of Fig. 3.

Fig. 3 is an elevation of Fig. 1, the cover plate being removed.

Fig. 4 is a partial section made according to line IVIV of Figs. 2 and3.

Fig. 5 is a partial'section made according to line V--V of Figs. 2 and3.

Fig. 6 is a diametral section similar to Fig. 2, showing aconstructional modification of an improved apparatus according to theinvention.

Fig. '7 is an elevation of Fig. 6, the cover plate being removed.

Fig. 8 is a partial section made according to line VIII-VIII of Figs. 6and 7.

The improved'electric switch with manometric control according to theinvention and illustrated in Figs. 1 to 5, is composed of a metalliccasing I of substantially cylindrical shape and terminating, on its rearface, in an axial cylindrical screw threaded projection 2 serving tosecure the apparatus on a suitable support (not shown), as well as toconnect the said apparatus to the pressure fluid conduit. The casing isprovided, on its periphery, with a part 3 in the shape of a nut havingeight sides, or the like, facilitating the fltting up of said apparatus.

The cylindrical interior of the casing I is so made as to constitute ashoulder l on which rests, once assembled, the resilient diaphragm 5 ofthe manometric box. This manometric box, inserted substantially withoutplay within the casing l, is constituted by the flexible diaphragm 5connected at its periphery to a rigid frustumshaped disc 6 having at itscenter a perforation I. On this disc 6 bears the bent down edge 8 of ametal disc 9 on which the contacts are mounted as will be describedlater on.

In order to ensure perfect fluid-tightness between the manometric box,disc 9 and casing i, these various parts are peripherally weldedtogether as shown at iii in Fig. 2. The fluid-tight chamber ll, formedbetween the diaphragm 5 and the rear wall of the casing I, communicates,through an axial perforation l2, with the pressure fluid piping, or thelike, connected to the screw-threaded projection 2 by any suitablemeans.

0n the disc 9 and at its upper part is secured, by means of a screw itor the like, the conductingflexible blade I! constituting the movablecontact of the switch. In order to avoid lateral pivotal'movementof theflexible blade IS, the

ter becomes distorted under the action of the pressure of the fluidcontained in. space i In the embodiment illustrated i v allow ofadjusting the length at ing finger ill, the latter consists threaded rodscrewed in a nut or the like dered rigid, by welding for instance, withblade l3. But it is obvious that this iinger i'i might be a simple rodriveted in a perioration of the blade 13.

At the free end of blade 83 is secured a contact piece I8 .whichnormally bears upon a fixed contact piece is secured, by any suitablemeans, on disc 9, but electrically insulated therefrom. In theembodiment illustrated, this flxed contact piece i9 is riveted on aconducting flange 20 having a suitable connecting tongue 2!. Thisconducting flange 20 is secured on disc 9 by means of two screws 22,members and washers 23, made of insulating material, ensuring elec tricinsulation, ontheone hand, between the flange 20 and, on the other hand,between the screws 22 and disc 9 (Fig. 5).

At its rear part, the casing I is closed by a disc 25, of insulatingmaterial, which is preferably beaded in said casing I, a perforationbeing provided in this disc for the passage of the connecting tongue 2I. I

It will be easily understood that when the pressure of the fluid, suchas a liquid, contained in the space H, exceeds a certain value, thediaphragm 5 bulgesor is distorted and comes into contact with the,flnger l3 so as to move it in the direction of the arrow 24, thusbreaking the contact between contact pieces I8 and I 9. On the otherhand when this pressure falls below the value chosen upon adjustment,the contacto pieces I8 and I9 are in contact and the connecting tongue2| rigid with the flange 20 .is connected to earth through the tongue l3and through the entire apparatus.

In the constructional modification illustrated in Figs. 6 to 8, the samereference numbers designate the same parts as in the form ofconstruction illustrated. in Figs. 1 to 5. This modificationparticularly differs from the form of construction shown in Figs. 1 to 5by the fact that the flexible blade I3 is electrically insulated fromthe disc 9 which has a bent down edge or flange. For that purpose, saidflexible blade l3 is.secured, at its upper part, to a conducting flange26, by means of a rivet 21, or the like. In order to prevent said bladel3 from laterally pivoting, the rlvet 21 and the perforations 32respectively provided in the flange 26 and blade l3, and in which thisrivet fits, are of prismatic shape. The flange 26 is secured on the disc9 in the same way as the flange 20 by means of two screws 33,

members and washers 28, of insulating material,

.nal. 3711 order that the screw or the should insulated from thediaphragm 5, en the latter comes in contact with screw owing to apressure exerted on this diaphragm,

between the screw i! and the diaphragm 5 is interposed an insulatingmember which may slot or a socket 30, the end of which, opposite screwl'i, has an insulating disc 3! preferably beaded in said end of socket30. This memher 35-3! is free in the axial direction and is guided inthe central perforations 'l and iii respectively provided in discs 6 and9.

Such apparatus are utilizable in all cases in which it is necessary toclose an electric circuit when the pressure of the fluid controlled bythe manonietric device falls below a certain value, and these contactapparatus are particularly utilizable for indicating the lack of supplyof lubricating oil to an internal combustion en gine; in this case, theyare perfectly applicable the device described in the French Patent No.794,303 of November 19, 1934.

The present invention is not limited to the forms of constructiondescribed above and illustrated, but it extends to all those utilizingthe features above set forth and adapted to produce the desired result,within the scope of the appended claims.

What I claim as my invention and desire to secure by Letters Patent ls:

1. In a pressure operated switch, a casing having an open end and soshaped as to have near its back wall a shoulder, a flexible diaphragmhearing at its periphery on said shoulder for forming a fluid-tightchamber between said diaphragm and said back wall of the casing, a rigidfrustum-shapeddisc resting on the periphery of said flexible diaphragmand having a perforation at its center, a cup-shaped member resting byits bent down edge on said disc and also having at its center a.perforation located opposite the perforation of sald disc, the casing,dia phragm, disc and cup being connected together in a fluid-tightmanner by welding, a flexible blade secured, by one of its ends, on saidcup, 3X45 movable contact mounted at the free end of said flexibleblade, 8. stationary-contact mounted on said cup so as to beelectrically insulated therefrom and with which said movable contact.normally engages, means passing through the perforations of the disc andof the cup and placed between said flexible blade and said flexibledla-.

phragm, so that when the latter becomes distorted, it moves the movablecontact away from the stationary contact by said means, a cover fittedon the open end of said casing for enclosing the various memberscontained in the latter.

2. In 'a pressure operated switch, a casing having an open end and soshaped as to have near its back wall a. shoulder, a threaded tubularprojection provided on said back wall of the casing and adapted to beconnected to a. piping supplying the fluid under pressure, a flexiblediaphragm bearing at its periphery on said shoulder for forming afluid-tight chamber between said diaphragm and said back wall of thecasing, a rigid frustum-shaped disc resting on the periphery of saidflexible diaphragm and having a perforation at its center, a cup-shapedmember resting by its bent down edge on said disc and also having at itscenter a perforation located opposite the perforation of said disc, thecasing, diaphragm, disc and cup being connected together in afluid-tight manner by welding, a flexible metal blade seis electricallyinsulated therefrom, a movable contact mounted at the free end of saidflexible blade. a stationary contact'mountcd on saidcup so as to beelectrically insulatedthereirom and with which said movable contactnormally ensases. a first metallic connection member connected to saidstationary contact. a second metallic connection member connected tosaid flexible blade. an adjustable screw mounted on saidflexperforations oi the disc and of the cup and inbetvqeen said flexiblediaphragm and the end or said adjustable screw. so that when saiddiaphragm distorts, said movable and stationary contacts are movedapart, a cover iitted on theopen end of said casina ior enclosing thevarious members contained in the latter. said coverhavingt'oholesiorthepassaseofsaidflrstand second metallic connectionmembers.

